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  1. or download this
    $quick[0][3]

$ref->{Oxford}{Ram}{Population}

$hash{ram}{mohan}{perl}{linux}
  2. or download this
    ( $quick[0] //= [] )->[3]

((( $ref //= {} )->{Oxford} //= {} )->{Ram} //= {} )->{Population}

((( $hash{ram} //= {} )->{mohan} //= {} )->{perl} //= {} )->{linux}